1 //===-- X86MCInstLower.cpp - Convert X86 MachineInstr to an MCInst --------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file contains code to lower X86 MachineInstrs to their corresponding 11 // MCInst records. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #include "X86AsmPrinter.h" 16 #include "X86RegisterInfo.h" 17 #include "X86ShuffleDecodeConstantPool.h" 18 #include "InstPrinter/X86ATTInstPrinter.h" 19 #include "MCTargetDesc/X86BaseInfo.h" 20 #include "Utils/X86ShuffleDecode.h" 21 #include "llvm/ADT/Optional.h" 22 #include "llvm/ADT/SmallString.h" 23 #include "llvm/ADT/iterator_range.h" 24 #include "llvm/CodeGen/MachineFunction.h" 25 #include "llvm/CodeGen/MachineConstantPool.h" 26 #include "llvm/CodeGen/MachineOperand.h" 27 #include "llvm/CodeGen/MachineModuleInfoImpls.h" 28 #include "llvm/CodeGen/StackMaps.h" 29 #include "llvm/IR/DataLayout.h" 30 #include "llvm/IR/GlobalValue.h" 31 #include "llvm/IR/Mangler.h" 32 #include "llvm/MC/MCAsmInfo.h" 33 #include "llvm/MC/MCCodeEmitter.h" 34 #include "llvm/MC/MCContext.h" 35 #include "llvm/MC/MCExpr.h" 36 #include "llvm/MC/MCFixup.h" 37 #include "llvm/MC/MCInst.h" 38 #include "llvm/MC/MCInstBuilder.h" 39 #include "llvm/MC/MCSection.h" 40 #include "llvm/MC/MCStreamer.h" 41 #include "llvm/MC/MCSymbol.h" 42 #include "llvm/MC/MCSymbolELF.h" 43 #include "llvm/MC/MCSectionELF.h" 44 #include "llvm/Support/TargetRegistry.h" 45 #include "llvm/Support/ELF.h" 46 #include "llvm/Target/TargetLoweringObjectFile.h" 47 48 using namespace llvm; 49 50 namespace { 51 52 /// X86MCInstLower - This class is used to lower an MachineInstr into an MCInst. 53 class X86MCInstLower { 54 MCContext &Ctx; 55 const MachineFunction &MF; 56 const TargetMachine &TM; 57 const MCAsmInfo &MAI; 58 X86AsmPrinter &AsmPrinter; 59 public: 60 X86MCInstLower(const MachineFunction &MF, X86AsmPrinter &asmprinter); 61 62 Optional<MCOperand> LowerMachineOperand(const MachineInstr *MI, 63 const MachineOperand &MO) const; 64 void Lower(const MachineInstr *MI, MCInst &OutMI) const; 65 66 MCSymbol *GetSymbolFromOperand(const MachineOperand &MO) const; 67 MCOperand LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const; 68 69 private: 70 MachineModuleInfoMachO &getMachOMMI() const; 71 Mangler *getMang() const { 72 return AsmPrinter.Mang; 73 } 74 }; 75 76 } // end anonymous namespace 77 78 // Emit a minimal sequence of nops spanning NumBytes bytes. 79 static void EmitNops(MCStreamer &OS, unsigned NumBytes, bool Is64Bit, 80 const MCSubtargetInfo &STI); 81 82 void X86AsmPrinter::StackMapShadowTracker::count(MCInst &Inst, 83 const MCSubtargetInfo &STI, 84 MCCodeEmitter *CodeEmitter) { 85 if (InShadow) { 86 SmallString<256> Code; 87 SmallVector<MCFixup, 4> Fixups; 88 raw_svector_ostream VecOS(Code); 89 CodeEmitter->encodeInstruction(Inst, VecOS, Fixups, STI); 90 CurrentShadowSize += Code.size(); 91 if (CurrentShadowSize >= RequiredShadowSize) 92 InShadow = false; // The shadow is big enough. Stop counting. 93 } 94 } 95 96 void X86AsmPrinter::StackMapShadowTracker::emitShadowPadding( 97 MCStreamer &OutStreamer, const MCSubtargetInfo &STI) { 98 if (InShadow && CurrentShadowSize < RequiredShadowSize) { 99 InShadow = false; 100 EmitNops(OutStreamer, RequiredShadowSize - CurrentShadowSize, 101 MF->getSubtarget<X86Subtarget>().is64Bit(), STI); 102 } 103 } 104 105 void X86AsmPrinter::EmitAndCountInstruction(MCInst &Inst) { 106 OutStreamer->EmitInstruction(Inst, getSubtargetInfo()); 107 SMShadowTracker.count(Inst, getSubtargetInfo(), CodeEmitter.get()); 108 } 109 110 X86MCInstLower::X86MCInstLower(const MachineFunction &mf, 111 X86AsmPrinter &asmprinter) 112 : Ctx(mf.getContext()), MF(mf), TM(mf.getTarget()), MAI(*TM.getMCAsmInfo()), 113 AsmPrinter(asmprinter) {} 114 115 MachineModuleInfoMachO &X86MCInstLower::getMachOMMI() const { 116 return MF.getMMI().getObjFileInfo<MachineModuleInfoMachO>(); 117 } 118 119 120 /// GetSymbolFromOperand - Lower an MO_GlobalAddress or MO_ExternalSymbol 121 /// operand to an MCSymbol. 122 MCSymbol *X86MCInstLower:: 123 GetSymbolFromOperand(const MachineOperand &MO) const { 124 const DataLayout &DL = MF.getDataLayout(); 125 assert((MO.isGlobal() || MO.isSymbol() || MO.isMBB()) && "Isn't a symbol reference"); 126 127 MCSymbol *Sym = nullptr; 128 SmallString<128> Name; 129 StringRef Suffix; 130 131 switch (MO.getTargetFlags()) { 132 case X86II::MO_DLLIMPORT: 133 // Handle dllimport linkage. 134 Name += "__imp_"; 135 break; 136 case X86II::MO_DARWIN_NONLAZY: 137 case X86II::MO_DARWIN_NONLAZY_PIC_BASE: 138 Suffix = "$non_lazy_ptr"; 139 break; 140 } 141 142 if (!Suffix.empty()) 143 Name += DL.getPrivateGlobalPrefix(); 144 145 if (MO.isGlobal()) { 146 const GlobalValue *GV = MO.getGlobal(); 147 AsmPrinter.getNameWithPrefix(Name, GV); 148 } else if (MO.isSymbol()) { 149 Mangler::getNameWithPrefix(Name, MO.getSymbolName(), DL); 150 } else if (MO.isMBB()) { 151 assert(Suffix.empty()); 152 Sym = MO.getMBB()->getSymbol(); 153 } 154 155 Name += Suffix; 156 if (!Sym) 157 Sym = Ctx.getOrCreateSymbol(Name); 158 159 // If the target flags on the operand changes the name of the symbol, do that 160 // before we return the symbol. 161 switch (MO.getTargetFlags()) { 162 default: break; 163 case X86II::MO_DARWIN_NONLAZY: 164 case X86II::MO_DARWIN_NONLAZY_PIC_BASE: { 165 MachineModuleInfoImpl::StubValueTy &StubSym = 166 getMachOMMI().getGVStubEntry(Sym); 167 if (!StubSym.getPointer()) { 168 assert(MO.isGlobal() && "Extern symbol not handled yet"); 169 StubSym = 170 MachineModuleInfoImpl:: 171 StubValueTy(AsmPrinter.getSymbol(MO.getGlobal()), 172 !MO.getGlobal()->hasInternalLinkage()); 173 } 174 break; 175 } 176 } 177 178 return Sym; 179 } 180 181 MCOperand X86MCInstLower::LowerSymbolOperand(const MachineOperand &MO, 182 MCSymbol *Sym) const { 183 // FIXME: We would like an efficient form for this, so we don't have to do a 184 // lot of extra uniquing. 185 const MCExpr *Expr = nullptr; 186 MCSymbolRefExpr::VariantKind RefKind = MCSymbolRefExpr::VK_None; 187 188 switch (MO.getTargetFlags()) { 189 default: llvm_unreachable("Unknown target flag on GV operand"); 190 case X86II::MO_NO_FLAG: // No flag. 191 // These affect the name of the symbol, not any suffix. 192 case X86II::MO_DARWIN_NONLAZY: 193 case X86II::MO_DLLIMPORT: 194 break; 195 196 case X86II::MO_TLVP: RefKind = MCSymbolRefExpr::VK_TLVP; break; 197 case X86II::MO_TLVP_PIC_BASE: 198 Expr = MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_TLVP, Ctx); 199 // Subtract the pic base. 200 Expr = MCBinaryExpr::createSub(Expr, 201 MCSymbolRefExpr::create(MF.getPICBaseSymbol(), 202 Ctx), 203 Ctx); 204 break; 205 case X86II::MO_SECREL: RefKind = MCSymbolRefExpr::VK_SECREL; break; 206 case X86II::MO_TLSGD: RefKind = MCSymbolRefExpr::VK_TLSGD; break; 207 case X86II::MO_TLSLD: RefKind = MCSymbolRefExpr::VK_TLSLD; break; 208 case X86II::MO_TLSLDM: RefKind = MCSymbolRefExpr::VK_TLSLDM; break; 209 case X86II::MO_GOTTPOFF: RefKind = MCSymbolRefExpr::VK_GOTTPOFF; break; 210 case X86II::MO_INDNTPOFF: RefKind = MCSymbolRefExpr::VK_INDNTPOFF; break; 211 case X86II::MO_TPOFF: RefKind = MCSymbolRefExpr::VK_TPOFF; break; 212 case X86II::MO_DTPOFF: RefKind = MCSymbolRefExpr::VK_DTPOFF; break; 213 case X86II::MO_NTPOFF: RefKind = MCSymbolRefExpr::VK_NTPOFF; break; 214 case X86II::MO_GOTNTPOFF: RefKind = MCSymbolRefExpr::VK_GOTNTPOFF; break; 215 case X86II::MO_GOTPCREL: RefKind = MCSymbolRefExpr::VK_GOTPCREL; break; 216 case X86II::MO_GOT: RefKind = MCSymbolRefExpr::VK_GOT; break; 217 case X86II::MO_GOTOFF: RefKind = MCSymbolRefExpr::VK_GOTOFF; break; 218 case X86II::MO_PLT: RefKind = MCSymbolRefExpr::VK_PLT; break; 219 case X86II::MO_PIC_BASE_OFFSET: 220 case X86II::MO_DARWIN_NONLAZY_PIC_BASE: 221 Expr = MCSymbolRefExpr::create(Sym, Ctx); 222 // Subtract the pic base. 223 Expr = MCBinaryExpr::createSub(Expr, 224 MCSymbolRefExpr::create(MF.getPICBaseSymbol(), Ctx), 225 Ctx); 226 if (MO.isJTI()) { 227 assert(MAI.doesSetDirectiveSuppressReloc()); 228 // If .set directive is supported, use it to reduce the number of 229 // relocations the assembler will generate for differences between 230 // local labels. This is only safe when the symbols are in the same 231 // section so we are restricting it to jumptable references. 232 MCSymbol *Label = Ctx.createTempSymbol(); 233 AsmPrinter.OutStreamer->EmitAssignment(Label, Expr); 234 Expr = MCSymbolRefExpr::create(Label, Ctx); 235 } 236 break; 237 } 238 239 if (!Expr) 240 Expr = MCSymbolRefExpr::create(Sym, RefKind, Ctx); 241 242 if (!MO.isJTI() && !MO.isMBB() && MO.getOffset()) 243 Expr = MCBinaryExpr::createAdd(Expr, 244 MCConstantExpr::create(MO.getOffset(), Ctx), 245 Ctx); 246 return MCOperand::createExpr(Expr); 247 } 248 249 250 /// \brief Simplify FOO $imm, %{al,ax,eax,rax} to FOO $imm, for instruction with 251 /// a short fixed-register form. 252 static void SimplifyShortImmForm(MCInst &Inst, unsigned Opcode) { 253 unsigned ImmOp = Inst.getNumOperands() - 1; 254 assert(Inst.getOperand(0).isReg() && 255 (Inst.getOperand(ImmOp).isImm() || Inst.getOperand(ImmOp).isExpr()) && 256 ((Inst.getNumOperands() == 3 && Inst.getOperand(1).isReg() && 257 Inst.getOperand(0).getReg() == Inst.getOperand(1).getReg()) || 258 Inst.getNumOperands() == 2) && "Unexpected instruction!"); 259 260 // Check whether the destination register can be fixed. 261 unsigned Reg = Inst.getOperand(0).getReg(); 262 if (Reg != X86::AL && Reg != X86::AX && Reg != X86::EAX && Reg != X86::RAX) 263 return; 264 265 // If so, rewrite the instruction. 266 MCOperand Saved = Inst.getOperand(ImmOp); 267 Inst = MCInst(); 268 Inst.setOpcode(Opcode); 269 Inst.addOperand(Saved); 270 } 271 272 /// \brief If a movsx instruction has a shorter encoding for the used register 273 /// simplify the instruction to use it instead. 274 static void SimplifyMOVSX(MCInst &Inst) { 275 unsigned NewOpcode = 0; 276 unsigned Op0 = Inst.getOperand(0).getReg(), Op1 = Inst.getOperand(1).getReg(); 277 switch (Inst.getOpcode()) { 278 default: 279 llvm_unreachable("Unexpected instruction!"); 280 case X86::MOVSX16rr8: // movsbw %al, %ax --> cbtw 281 if (Op0 == X86::AX && Op1 == X86::AL) 282 NewOpcode = X86::CBW; 283 break; 284 case X86::MOVSX32rr16: // movswl %ax, %eax --> cwtl 285 if (Op0 == X86::EAX && Op1 == X86::AX) 286 NewOpcode = X86::CWDE; 287 break; 288 case X86::MOVSX64rr32: // movslq %eax, %rax --> cltq 289 if (Op0 == X86::RAX && Op1 == X86::EAX) 290 NewOpcode = X86::CDQE; 291 break; 292 } 293 294 if (NewOpcode != 0) { 295 Inst = MCInst(); 296 Inst.setOpcode(NewOpcode); 297 } 298 } 299 300 /// \brief Simplify things like MOV32rm to MOV32o32a. 301 static void SimplifyShortMoveForm(X86AsmPrinter &Printer, MCInst &Inst, 302 unsigned Opcode) { 303 // Don't make these simplifications in 64-bit mode; other assemblers don't 304 // perform them because they make the code larger. 305 if (Printer.getSubtarget().is64Bit()) 306 return; 307 308 bool IsStore = Inst.getOperand(0).isReg() && Inst.getOperand(1).isReg(); 309 unsigned AddrBase = IsStore; 310 unsigned RegOp = IsStore ? 0 : 5; 311 unsigned AddrOp = AddrBase + 3; 312 assert(Inst.getNumOperands() == 6 && Inst.getOperand(RegOp).isReg() && 313 Inst.getOperand(AddrBase + X86::AddrBaseReg).isReg() && 314 Inst.getOperand(AddrBase + X86::AddrScaleAmt).isImm() && 315 Inst.getOperand(AddrBase + X86::AddrIndexReg).isReg() && 316 Inst.getOperand(AddrBase + X86::AddrSegmentReg).isReg() && 317 (Inst.getOperand(AddrOp).isExpr() || 318 Inst.getOperand(AddrOp).isImm()) && 319 "Unexpected instruction!"); 320 321 // Check whether the destination register can be fixed. 322 unsigned Reg = Inst.getOperand(RegOp).getReg(); 323 if (Reg != X86::AL && Reg != X86::AX && Reg != X86::EAX && Reg != X86::RAX) 324 return; 325 326 // Check whether this is an absolute address. 327 // FIXME: We know TLVP symbol refs aren't, but there should be a better way 328 // to do this here. 329 bool Absolute = true; 330 if (Inst.getOperand(AddrOp).isExpr()) { 331 const MCExpr *MCE = Inst.getOperand(AddrOp).getExpr(); 332 if (const MCSymbolRefExpr *SRE = dyn_cast<MCSymbolRefExpr>(MCE)) 333 if (SRE->getKind() == MCSymbolRefExpr::VK_TLVP) 334 Absolute = false; 335 } 336 337 if (Absolute && 338 (Inst.getOperand(AddrBase + X86::AddrBaseReg).getReg() != 0 || 339 Inst.getOperand(AddrBase + X86::AddrScaleAmt).getImm() != 1 || 340 Inst.getOperand(AddrBase + X86::AddrIndexReg).getReg() != 0)) 341 return; 342 343 // If so, rewrite the instruction. 344 MCOperand Saved = Inst.getOperand(AddrOp); 345 MCOperand Seg = Inst.getOperand(AddrBase + X86::AddrSegmentReg); 346 Inst = MCInst(); 347 Inst.setOpcode(Opcode); 348 Inst.addOperand(Saved); 349 Inst.addOperand(Seg); 350 } 351 352 static unsigned getRetOpcode(const X86Subtarget &Subtarget) { 353 return Subtarget.is64Bit() ? X86::RETQ : X86::RETL; 354 } 355 356 Optional<MCOperand> 357 X86MCInstLower::LowerMachineOperand(const MachineInstr *MI, 358 const MachineOperand &MO) const { 359 switch (MO.getType()) { 360 default: 361 MI->dump(); 362 llvm_unreachable("unknown operand type"); 363 case MachineOperand::MO_Register: 364 // Ignore all implicit register operands. 365 if (MO.isImplicit()) 366 return None; 367 return MCOperand::createReg(MO.getReg()); 368 case MachineOperand::MO_Immediate: 369 return MCOperand::createImm(MO.getImm()); 370 case MachineOperand::MO_MachineBasicBlock: 371 case MachineOperand::MO_GlobalAddress: 372 case MachineOperand::MO_ExternalSymbol: 373 return LowerSymbolOperand(MO, GetSymbolFromOperand(MO)); 374 case MachineOperand::MO_MCSymbol: 375 return LowerSymbolOperand(MO, MO.getMCSymbol()); 376 case MachineOperand::MO_JumpTableIndex: 377 return LowerSymbolOperand(MO, AsmPrinter.GetJTISymbol(MO.getIndex())); 378 case MachineOperand::MO_ConstantPoolIndex: 379 return LowerSymbolOperand(MO, AsmPrinter.GetCPISymbol(MO.getIndex())); 380 case MachineOperand::MO_BlockAddress: 381 return LowerSymbolOperand( 382 MO, AsmPrinter.GetBlockAddressSymbol(MO.getBlockAddress())); 383 case MachineOperand::MO_RegisterMask: 384 // Ignore call clobbers. 385 return None; 386 } 387 } 388 389 void X86MCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const { 390 OutMI.setOpcode(MI->getOpcode()); 391 392 for (const MachineOperand &MO : MI->operands()) 393 if (auto MaybeMCOp = LowerMachineOperand(MI, MO)) 394 OutMI.addOperand(MaybeMCOp.getValue()); 395 396 // Handle a few special cases to eliminate operand modifiers. 397 ReSimplify: 398 switch (OutMI.getOpcode()) { 399 case X86::LEA64_32r: 400 case X86::LEA64r: 401 case X86::LEA16r: 402 case X86::LEA32r: 403 // LEA should have a segment register, but it must be empty. 404 assert(OutMI.getNumOperands() == 1+X86::AddrNumOperands && 405 "Unexpected # of LEA operands"); 406 assert(OutMI.getOperand(1+X86::AddrSegmentReg).getReg() == 0 && 407 "LEA has segment specified!"); 408 break; 409 410 // Commute operands to get a smaller encoding by using VEX.R instead of VEX.B 411 // if one of the registers is extended, but other isn't. 412 case X86::VMOVZPQILo2PQIrr: 413 case X86::VMOVAPDrr: 414 case X86::VMOVAPDYrr: 415 case X86::VMOVAPSrr: 416 case X86::VMOVAPSYrr: 417 case X86::VMOVDQArr: 418 case X86::VMOVDQAYrr: 419 case X86::VMOVDQUrr: 420 case X86::VMOVDQUYrr: 421 case X86::VMOVUPDrr: 422 case X86::VMOVUPDYrr: 423 case X86::VMOVUPSrr: 424 case X86::VMOVUPSYrr: { 425 if (!X86II::isX86_64ExtendedReg(OutMI.getOperand(0).getReg()) && 426 X86II::isX86_64ExtendedReg(OutMI.getOperand(1).getReg())) { 427 unsigned NewOpc; 428 switch (OutMI.getOpcode()) { 429 default: llvm_unreachable("Invalid opcode"); 430 case X86::VMOVZPQILo2PQIrr: NewOpc = X86::VMOVPQI2QIrr; break; 431 case X86::VMOVAPDrr: NewOpc = X86::VMOVAPDrr_REV; break; 432 case X86::VMOVAPDYrr: NewOpc = X86::VMOVAPDYrr_REV; break; 433 case X86::VMOVAPSrr: NewOpc = X86::VMOVAPSrr_REV; break; 434 case X86::VMOVAPSYrr: NewOpc = X86::VMOVAPSYrr_REV; break; 435 case X86::VMOVDQArr: NewOpc = X86::VMOVDQArr_REV; break; 436 case X86::VMOVDQAYrr: NewOpc = X86::VMOVDQAYrr_REV; break; 437 case X86::VMOVDQUrr: NewOpc = X86::VMOVDQUrr_REV; break; 438 case X86::VMOVDQUYrr: NewOpc = X86::VMOVDQUYrr_REV; break; 439 case X86::VMOVUPDrr: NewOpc = X86::VMOVUPDrr_REV; break; 440 case X86::VMOVUPDYrr: NewOpc = X86::VMOVUPDYrr_REV; break; 441 case X86::VMOVUPSrr: NewOpc = X86::VMOVUPSrr_REV; break; 442 case X86::VMOVUPSYrr: NewOpc = X86::VMOVUPSYrr_REV; break; 443 } 444 OutMI.setOpcode(NewOpc); 445 } 446 break; 447 } 448 case X86::VMOVSDrr: 449 case X86::VMOVSSrr: { 450 if (!X86II::isX86_64ExtendedReg(OutMI.getOperand(0).getReg()) && 451 X86II::isX86_64ExtendedReg(OutMI.getOperand(2).getReg())) { 452 unsigned NewOpc; 453 switch (OutMI.getOpcode()) { 454 default: llvm_unreachable("Invalid opcode"); 455 case X86::VMOVSDrr: NewOpc = X86::VMOVSDrr_REV; break; 456 case X86::VMOVSSrr: NewOpc = X86::VMOVSSrr_REV; break; 457 } 458 OutMI.setOpcode(NewOpc); 459 } 460 break; 461 } 462 463 // TAILJMPr64, CALL64r, CALL64pcrel32 - These instructions have register 464 // inputs modeled as normal uses instead of implicit uses. As such, truncate 465 // off all but the first operand (the callee). FIXME: Change isel. 466 case X86::TAILJMPr64: 467 case X86::TAILJMPr64_REX: 468 case X86::CALL64r: 469 case X86::CALL64pcrel32: { 470 unsigned Opcode = OutMI.getOpcode(); 471 MCOperand Saved = OutMI.getOperand(0); 472 OutMI = MCInst(); 473 OutMI.setOpcode(Opcode); 474 OutMI.addOperand(Saved); 475 break; 476 } 477 478 case X86::EH_RETURN: 479 case X86::EH_RETURN64: { 480 OutMI = MCInst(); 481 OutMI.setOpcode(getRetOpcode(AsmPrinter.getSubtarget())); 482 break; 483 } 484 485 case X86::CLEANUPRET: { 486 // Replace CATCHRET with the appropriate RET. 487 OutMI = MCInst(); 488 OutMI.setOpcode(getRetOpcode(AsmPrinter.getSubtarget())); 489 break; 490 } 491 492 case X86::CATCHRET: { 493 // Replace CATCHRET with the appropriate RET. 494 const X86Subtarget &Subtarget = AsmPrinter.getSubtarget(); 495 unsigned ReturnReg = Subtarget.is64Bit() ? X86::RAX : X86::EAX; 496 OutMI = MCInst(); 497 OutMI.setOpcode(getRetOpcode(Subtarget)); 498 OutMI.addOperand(MCOperand::createReg(ReturnReg)); 499 break; 500 } 501 502 // TAILJMPd, TAILJMPd64, TailJMPd_cc - Lower to the correct jump instruction. 503 { unsigned Opcode; 504 case X86::TAILJMPr: Opcode = X86::JMP32r; goto SetTailJmpOpcode; 505 case X86::TAILJMPd: 506 case X86::TAILJMPd64: Opcode = X86::JMP_1; goto SetTailJmpOpcode; 507 case X86::TAILJMPd_CC: 508 case X86::TAILJMPd64_CC: 509 Opcode = X86::GetCondBranchFromCond( 510 static_cast<X86::CondCode>(MI->getOperand(1).getImm())); 511 goto SetTailJmpOpcode; 512 513 SetTailJmpOpcode: 514 MCOperand Saved = OutMI.getOperand(0); 515 OutMI = MCInst(); 516 OutMI.setOpcode(Opcode); 517 OutMI.addOperand(Saved); 518 break; 519 } 520 521 case X86::DEC16r: 522 case X86::DEC32r: 523 case X86::INC16r: 524 case X86::INC32r: 525 // If we aren't in 64-bit mode we can use the 1-byte inc/dec instructions. 526 if (!AsmPrinter.getSubtarget().is64Bit()) { 527 unsigned Opcode; 528 switch (OutMI.getOpcode()) { 529 default: llvm_unreachable("Invalid opcode"); 530 case X86::DEC16r: Opcode = X86::DEC16r_alt; break; 531 case X86::DEC32r: Opcode = X86::DEC32r_alt; break; 532 case X86::INC16r: Opcode = X86::INC16r_alt; break; 533 case X86::INC32r: Opcode = X86::INC32r_alt; break; 534 } 535 OutMI.setOpcode(Opcode); 536 } 537 break; 538 539 // These are pseudo-ops for OR to help with the OR->ADD transformation. We do 540 // this with an ugly goto in case the resultant OR uses EAX and needs the 541 // short form. 542 case X86::ADD16rr_DB: OutMI.setOpcode(X86::OR16rr); goto ReSimplify; 543 case X86::ADD32rr_DB: OutMI.setOpcode(X86::OR32rr); goto ReSimplify; 544 case X86::ADD64rr_DB: OutMI.setOpcode(X86::OR64rr); goto ReSimplify; 545 case X86::ADD16ri_DB: OutMI.setOpcode(X86::OR16ri); goto ReSimplify; 546 case X86::ADD32ri_DB: OutMI.setOpcode(X86::OR32ri); goto ReSimplify; 547 case X86::ADD64ri32_DB: OutMI.setOpcode(X86::OR64ri32); goto ReSimplify; 548 case X86::ADD16ri8_DB: OutMI.setOpcode(X86::OR16ri8); goto ReSimplify; 549 case X86::ADD32ri8_DB: OutMI.setOpcode(X86::OR32ri8); goto ReSimplify; 550 case X86::ADD64ri8_DB: OutMI.setOpcode(X86::OR64ri8); goto ReSimplify; 551 552 // Atomic load and store require a separate pseudo-inst because Acquire 553 // implies mayStore and Release implies mayLoad; fix these to regular MOV 554 // instructions here 555 case X86::ACQUIRE_MOV8rm: OutMI.setOpcode(X86::MOV8rm); goto ReSimplify; 556 case X86::ACQUIRE_MOV16rm: OutMI.setOpcode(X86::MOV16rm); goto ReSimplify; 557 case X86::ACQUIRE_MOV32rm: OutMI.setOpcode(X86::MOV32rm); goto ReSimplify; 558 case X86::ACQUIRE_MOV64rm: OutMI.setOpcode(X86::MOV64rm); goto ReSimplify; 559 case X86::RELEASE_MOV8mr: OutMI.setOpcode(X86::MOV8mr); goto ReSimplify; 560 case X86::RELEASE_MOV16mr: OutMI.setOpcode(X86::MOV16mr); goto ReSimplify; 561 case X86::RELEASE_MOV32mr: OutMI.setOpcode(X86::MOV32mr); goto ReSimplify; 562 case X86::RELEASE_MOV64mr: OutMI.setOpcode(X86::MOV64mr); goto ReSimplify; 563 case X86::RELEASE_MOV8mi: OutMI.setOpcode(X86::MOV8mi); goto ReSimplify; 564 case X86::RELEASE_MOV16mi: OutMI.setOpcode(X86::MOV16mi); goto ReSimplify; 565 case X86::RELEASE_MOV32mi: OutMI.setOpcode(X86::MOV32mi); goto ReSimplify; 566 case X86::RELEASE_MOV64mi32: OutMI.setOpcode(X86::MOV64mi32); goto ReSimplify; 567 case X86::RELEASE_ADD8mi: OutMI.setOpcode(X86::ADD8mi); goto ReSimplify; 568 case X86::RELEASE_ADD8mr: OutMI.setOpcode(X86::ADD8mr); goto ReSimplify; 569 case X86::RELEASE_ADD32mi: OutMI.setOpcode(X86::ADD32mi); goto ReSimplify; 570 case X86::RELEASE_ADD32mr: OutMI.setOpcode(X86::ADD32mr); goto ReSimplify; 571 case X86::RELEASE_ADD64mi32: OutMI.setOpcode(X86::ADD64mi32); goto ReSimplify; 572 case X86::RELEASE_ADD64mr: OutMI.setOpcode(X86::ADD64mr); goto ReSimplify; 573 case X86::RELEASE_AND8mi: OutMI.setOpcode(X86::AND8mi); goto ReSimplify; 574 case X86::RELEASE_AND8mr: OutMI.setOpcode(X86::AND8mr); goto ReSimplify; 575 case X86::RELEASE_AND32mi: OutMI.setOpcode(X86::AND32mi); goto ReSimplify; 576 case X86::RELEASE_AND32mr: OutMI.setOpcode(X86::AND32mr); goto ReSimplify; 577 case X86::RELEASE_AND64mi32: OutMI.setOpcode(X86::AND64mi32); goto ReSimplify; 578 case X86::RELEASE_AND64mr: OutMI.setOpcode(X86::AND64mr); goto ReSimplify; 579 case X86::RELEASE_OR8mi: OutMI.setOpcode(X86::OR8mi); goto ReSimplify; 580 case X86::RELEASE_OR8mr: OutMI.setOpcode(X86::OR8mr); goto ReSimplify; 581 case X86::RELEASE_OR32mi: OutMI.setOpcode(X86::OR32mi); goto ReSimplify; 582 case X86::RELEASE_OR32mr: OutMI.setOpcode(X86::OR32mr); goto ReSimplify; 583 case X86::RELEASE_OR64mi32: OutMI.setOpcode(X86::OR64mi32); goto ReSimplify; 584 case X86::RELEASE_OR64mr: OutMI.setOpcode(X86::OR64mr); goto ReSimplify; 585 case X86::RELEASE_XOR8mi: OutMI.setOpcode(X86::XOR8mi); goto ReSimplify; 586 case X86::RELEASE_XOR8mr: OutMI.setOpcode(X86::XOR8mr); goto ReSimplify; 587 case X86::RELEASE_XOR32mi: OutMI.setOpcode(X86::XOR32mi); goto ReSimplify; 588 case X86::RELEASE_XOR32mr: OutMI.setOpcode(X86::XOR32mr); goto ReSimplify; 589 case X86::RELEASE_XOR64mi32: OutMI.setOpcode(X86::XOR64mi32); goto ReSimplify; 590 case X86::RELEASE_XOR64mr: OutMI.setOpcode(X86::XOR64mr); goto ReSimplify; 591 case X86::RELEASE_INC8m: OutMI.setOpcode(X86::INC8m); goto ReSimplify; 592 case X86::RELEASE_INC16m: OutMI.setOpcode(X86::INC16m); goto ReSimplify; 593 case X86::RELEASE_INC32m: OutMI.setOpcode(X86::INC32m); goto ReSimplify; 594 case X86::RELEASE_INC64m: OutMI.setOpcode(X86::INC64m); goto ReSimplify; 595 case X86::RELEASE_DEC8m: OutMI.setOpcode(X86::DEC8m); goto ReSimplify; 596 case X86::RELEASE_DEC16m: OutMI.setOpcode(X86::DEC16m); goto ReSimplify; 597 case X86::RELEASE_DEC32m: OutMI.setOpcode(X86::DEC32m); goto ReSimplify; 598 case X86::RELEASE_DEC64m: OutMI.setOpcode(X86::DEC64m); goto ReSimplify; 599 600 // We don't currently select the correct instruction form for instructions 601 // which have a short %eax, etc. form. Handle this by custom lowering, for 602 // now. 603 // 604 // Note, we are currently not handling the following instructions: 605 // MOV64ao8, MOV64o8a 606 // XCHG16ar, XCHG32ar, XCHG64ar 607 case X86::MOV8mr_NOREX: 608 case X86::MOV8mr: 609 case X86::MOV8rm_NOREX: 610 case X86::MOV8rm: 611 case X86::MOV16mr: 612 case X86::MOV16rm: 613 case X86::MOV32mr: 614 case X86::MOV32rm: { 615 unsigned NewOpc; 616 switch (OutMI.getOpcode()) { 617 default: llvm_unreachable("Invalid opcode"); 618 case X86::MOV8mr_NOREX: 619 case X86::MOV8mr: NewOpc = X86::MOV8o32a; break; 620 case X86::MOV8rm_NOREX: 621 case X86::MOV8rm: NewOpc = X86::MOV8ao32; break; 622 case X86::MOV16mr: NewOpc = X86::MOV16o32a; break; 623 case X86::MOV16rm: NewOpc = X86::MOV16ao32; break; 624 case X86::MOV32mr: NewOpc = X86::MOV32o32a; break; 625 case X86::MOV32rm: NewOpc = X86::MOV32ao32; break; 626 } 627 SimplifyShortMoveForm(AsmPrinter, OutMI, NewOpc); 628 break; 629 } 630 631 case X86::ADC8ri: case X86::ADC16ri: case X86::ADC32ri: case X86::ADC64ri32: 632 case X86::ADD8ri: case X86::ADD16ri: case X86::ADD32ri: case X86::ADD64ri32: 633 case X86::AND8ri: case X86::AND16ri: case X86::AND32ri: case X86::AND64ri32: 634 case X86::CMP8ri: case X86::CMP16ri: case X86::CMP32ri: case X86::CMP64ri32: 635 case X86::OR8ri: case X86::OR16ri: case X86::OR32ri: case X86::OR64ri32: 636 case X86::SBB8ri: case X86::SBB16ri: case X86::SBB32ri: case X86::SBB64ri32: 637 case X86::SUB8ri: case X86::SUB16ri: case X86::SUB32ri: case X86::SUB64ri32: 638 case X86::TEST8ri:case X86::TEST16ri:case X86::TEST32ri:case X86::TEST64ri32: 639 case X86::XOR8ri: case X86::XOR16ri: case X86::XOR32ri: case X86::XOR64ri32: { 640 unsigned NewOpc; 641 switch (OutMI.getOpcode()) { 642 default: llvm_unreachable("Invalid opcode"); 643 case X86::ADC8ri: NewOpc = X86::ADC8i8; break; 644 case X86::ADC16ri: NewOpc = X86::ADC16i16; break; 645 case X86::ADC32ri: NewOpc = X86::ADC32i32; break; 646 case X86::ADC64ri32: NewOpc = X86::ADC64i32; break; 647 case X86::ADD8ri: NewOpc = X86::ADD8i8; break; 648 case X86::ADD16ri: NewOpc = X86::ADD16i16; break; 649 case X86::ADD32ri: NewOpc = X86::ADD32i32; break; 650 case X86::ADD64ri32: NewOpc = X86::ADD64i32; break; 651 case X86::AND8ri: NewOpc = X86::AND8i8; break; 652 case X86::AND16ri: NewOpc = X86::AND16i16; break; 653 case X86::AND32ri: NewOpc = X86::AND32i32; break; 654 case X86::AND64ri32: NewOpc = X86::AND64i32; break; 655 case X86::CMP8ri: NewOpc = X86::CMP8i8; break; 656 case X86::CMP16ri: NewOpc = X86::CMP16i16; break; 657 case X86::CMP32ri: NewOpc = X86::CMP32i32; break; 658 case X86::CMP64ri32: NewOpc = X86::CMP64i32; break; 659 case X86::OR8ri: NewOpc = X86::OR8i8; break; 660 case X86::OR16ri: NewOpc = X86::OR16i16; break; 661 case X86::OR32ri: NewOpc = X86::OR32i32; break; 662 case X86::OR64ri32: NewOpc = X86::OR64i32; break; 663 case X86::SBB8ri: NewOpc = X86::SBB8i8; break; 664 case X86::SBB16ri: NewOpc = X86::SBB16i16; break; 665 case X86::SBB32ri: NewOpc = X86::SBB32i32; break; 666 case X86::SBB64ri32: NewOpc = X86::SBB64i32; break; 667 case X86::SUB8ri: NewOpc = X86::SUB8i8; break; 668 case X86::SUB16ri: NewOpc = X86::SUB16i16; break; 669 case X86::SUB32ri: NewOpc = X86::SUB32i32; break; 670 case X86::SUB64ri32: NewOpc = X86::SUB64i32; break; 671 case X86::TEST8ri: NewOpc = X86::TEST8i8; break; 672 case X86::TEST16ri: NewOpc = X86::TEST16i16; break; 673 case X86::TEST32ri: NewOpc = X86::TEST32i32; break; 674 case X86::TEST64ri32: NewOpc = X86::TEST64i32; break; 675 case X86::XOR8ri: NewOpc = X86::XOR8i8; break; 676 case X86::XOR16ri: NewOpc = X86::XOR16i16; break; 677 case X86::XOR32ri: NewOpc = X86::XOR32i32; break; 678 case X86::XOR64ri32: NewOpc = X86::XOR64i32; break; 679 } 680 SimplifyShortImmForm(OutMI, NewOpc); 681 break; 682 } 683 684 // Try to shrink some forms of movsx. 685 case X86::MOVSX16rr8: 686 case X86::MOVSX32rr16: 687 case X86::MOVSX64rr32: 688 SimplifyMOVSX(OutMI); 689 break; 690 } 691 } 692 693 void X86AsmPrinter::LowerTlsAddr(X86MCInstLower &MCInstLowering, 694 const MachineInstr &MI) { 695 696 bool is64Bits = MI.getOpcode() == X86::TLS_addr64 || 697 MI.getOpcode() == X86::TLS_base_addr64; 698 699 bool needsPadding = MI.getOpcode() == X86::TLS_addr64; 700 701 MCContext &context = OutStreamer->getContext(); 702 703 if (needsPadding) 704 EmitAndCountInstruction(MCInstBuilder(X86::DATA16_PREFIX)); 705 706 MCSymbolRefExpr::VariantKind SRVK; 707 switch (MI.getOpcode()) { 708 case X86::TLS_addr32: 709 case X86::TLS_addr64: 710 SRVK = MCSymbolRefExpr::VK_TLSGD; 711 break; 712 case X86::TLS_base_addr32: 713 SRVK = MCSymbolRefExpr::VK_TLSLDM; 714 break; 715 case X86::TLS_base_addr64: 716 SRVK = MCSymbolRefExpr::VK_TLSLD; 717 break; 718 default: 719 llvm_unreachable("unexpected opcode"); 720 } 721 722 MCSymbol *sym = MCInstLowering.GetSymbolFromOperand(MI.getOperand(3)); 723 const MCSymbolRefExpr *symRef = MCSymbolRefExpr::create(sym, SRVK, context); 724 725 MCInst LEA; 726 if (is64Bits) { 727 LEA.setOpcode(X86::LEA64r); 728 LEA.addOperand(MCOperand::createReg(X86::RDI)); // dest 729 LEA.addOperand(MCOperand::createReg(X86::RIP)); // base 730 LEA.addOperand(MCOperand::createImm(1)); // scale 731 LEA.addOperand(MCOperand::createReg(0)); // index 732 LEA.addOperand(MCOperand::createExpr(symRef)); // disp 733 LEA.addOperand(MCOperand::createReg(0)); // seg 734 } else if (SRVK == MCSymbolRefExpr::VK_TLSLDM) { 735 LEA.setOpcode(X86::LEA32r); 736 LEA.addOperand(MCOperand::createReg(X86::EAX)); // dest 737 LEA.addOperand(MCOperand::createReg(X86::EBX)); // base 738 LEA.addOperand(MCOperand::createImm(1)); // scale 739 LEA.addOperand(MCOperand::createReg(0)); // index 740 LEA.addOperand(MCOperand::createExpr(symRef)); // disp 741 LEA.addOperand(MCOperand::createReg(0)); // seg 742 } else { 743 LEA.setOpcode(X86::LEA32r); 744 LEA.addOperand(MCOperand::createReg(X86::EAX)); // dest 745 LEA.addOperand(MCOperand::createReg(0)); // base 746 LEA.addOperand(MCOperand::createImm(1)); // scale 747 LEA.addOperand(MCOperand::createReg(X86::EBX)); // index 748 LEA.addOperand(MCOperand::createExpr(symRef)); // disp 749 LEA.addOperand(MCOperand::createReg(0)); // seg 750 } 751 EmitAndCountInstruction(LEA); 752 753 if (needsPadding) { 754 EmitAndCountInstruction(MCInstBuilder(X86::DATA16_PREFIX)); 755 EmitAndCountInstruction(MCInstBuilder(X86::DATA16_PREFIX)); 756 EmitAndCountInstruction(MCInstBuilder(X86::REX64_PREFIX)); 757 } 758 759 StringRef name = is64Bits ? "__tls_get_addr" : "___tls_get_addr"; 760 MCSymbol *tlsGetAddr = context.getOrCreateSymbol(name); 761 const MCSymbolRefExpr *tlsRef = 762 MCSymbolRefExpr::create(tlsGetAddr, 763 MCSymbolRefExpr::VK_PLT, 764 context); 765 766 EmitAndCountInstruction(MCInstBuilder(is64Bits ? X86::CALL64pcrel32 767 : X86::CALLpcrel32) 768 .addExpr(tlsRef)); 769 } 770 771 /// \brief Emit the largest nop instruction smaller than or equal to \p NumBytes 772 /// bytes. Return the size of nop emitted. 773 static unsigned EmitNop(MCStreamer &OS, unsigned NumBytes, bool Is64Bit, 774 const MCSubtargetInfo &STI) { 775 // This works only for 64bit. For 32bit we have to do additional checking if 776 // the CPU supports multi-byte nops. 777 assert(Is64Bit && "EmitNops only supports X86-64"); 778 779 unsigned NopSize; 780 unsigned Opc, BaseReg, ScaleVal, IndexReg, Displacement, SegmentReg; 781 Opc = IndexReg = Displacement = SegmentReg = 0; 782 BaseReg = X86::RAX; 783 ScaleVal = 1; 784 switch (NumBytes) { 785 case 0: llvm_unreachable("Zero nops?"); break; 786 case 1: NopSize = 1; Opc = X86::NOOP; break; 787 case 2: NopSize = 2; Opc = X86::XCHG16ar; break; 788 case 3: NopSize = 3; Opc = X86::NOOPL; break; 789 case 4: NopSize = 4; Opc = X86::NOOPL; Displacement = 8; break; 790 case 5: NopSize = 5; Opc = X86::NOOPL; Displacement = 8; 791 IndexReg = X86::RAX; break; 792 case 6: NopSize = 6; Opc = X86::NOOPW; Displacement = 8; 793 IndexReg = X86::RAX; break; 794 case 7: NopSize = 7; Opc = X86::NOOPL; Displacement = 512; break; 795 case 8: NopSize = 8; Opc = X86::NOOPL; Displacement = 512; 796 IndexReg = X86::RAX; break; 797 case 9: NopSize = 9; Opc = X86::NOOPW; Displacement = 512; 798 IndexReg = X86::RAX; break; 799 default: NopSize = 10; Opc = X86::NOOPW; Displacement = 512; 800 IndexReg = X86::RAX; SegmentReg = X86::CS; break; 801 } 802 803 unsigned NumPrefixes = std::min(NumBytes - NopSize, 5U); 804 NopSize += NumPrefixes; 805 for (unsigned i = 0; i != NumPrefixes; ++i) 806 OS.EmitBytes("\x66"); 807 808 switch (Opc) { 809 default: 810 llvm_unreachable("Unexpected opcode"); 811 break; 812 case X86::NOOP: 813 OS.EmitInstruction(MCInstBuilder(Opc), STI); 814 break; 815 case X86::XCHG16ar: 816 OS.EmitInstruction(MCInstBuilder(Opc).addReg(X86::AX), STI); 817 break; 818 case X86::NOOPL: 819 case X86::NOOPW: 820 OS.EmitInstruction(MCInstBuilder(Opc) 821 .addReg(BaseReg) 822 .addImm(ScaleVal) 823 .addReg(IndexReg) 824 .addImm(Displacement) 825 .addReg(SegmentReg), 826 STI); 827 break; 828 } 829 assert(NopSize <= NumBytes && "We overemitted?"); 830 return NopSize; 831 } 832 833 /// \brief Emit the optimal amount of multi-byte nops on X86. 834 static void EmitNops(MCStreamer &OS, unsigned NumBytes, bool Is64Bit, 835 const MCSubtargetInfo &STI) { 836 unsigned NopsToEmit = NumBytes; 837 (void)NopsToEmit; 838 while (NumBytes) { 839 NumBytes -= EmitNop(OS, NumBytes, Is64Bit, STI); 840 assert(NopsToEmit >= NumBytes && "Emitted more than I asked for!"); 841 } 842 } 843 844 void X86AsmPrinter::LowerSTATEPOINT(const MachineInstr &MI, 845 X86MCInstLower &MCIL) { 846 assert(Subtarget->is64Bit() && "Statepoint currently only supports X86-64"); 847 848 StatepointOpers SOpers(&MI); 849 if (unsigned PatchBytes = SOpers.getNumPatchBytes()) { 850 EmitNops(*OutStreamer, PatchBytes, Subtarget->is64Bit(), 851 getSubtargetInfo()); 852 } else { 853 // Lower call target and choose correct opcode 854 const MachineOperand &CallTarget = SOpers.getCallTarget(); 855 MCOperand CallTargetMCOp; 856 unsigned CallOpcode; 857 switch (CallTarget.getType()) { 858 case MachineOperand::MO_GlobalAddress: 859 case MachineOperand::MO_ExternalSymbol: 860 CallTargetMCOp = MCIL.LowerSymbolOperand( 861 CallTarget, MCIL.GetSymbolFromOperand(CallTarget)); 862 CallOpcode = X86::CALL64pcrel32; 863 // Currently, we only support relative addressing with statepoints. 864 // Otherwise, we'll need a scratch register to hold the target 865 // address. You'll fail asserts during load & relocation if this 866 // symbol is to far away. (TODO: support non-relative addressing) 867 break; 868 case MachineOperand::MO_Immediate: 869 CallTargetMCOp = MCOperand::createImm(CallTarget.getImm()); 870 CallOpcode = X86::CALL64pcrel32; 871 // Currently, we only support relative addressing with statepoints. 872 // Otherwise, we'll need a scratch register to hold the target 873 // immediate. You'll fail asserts during load & relocation if this 874 // address is to far away. (TODO: support non-relative addressing) 875 break; 876 case MachineOperand::MO_Register: 877 CallTargetMCOp = MCOperand::createReg(CallTarget.getReg()); 878 CallOpcode = X86::CALL64r; 879 break; 880 default: 881 llvm_unreachable("Unsupported operand type in statepoint call target"); 882 break; 883 } 884 885 // Emit call 886 MCInst CallInst; 887 CallInst.setOpcode(CallOpcode); 888 CallInst.addOperand(CallTargetMCOp); 889 OutStreamer->EmitInstruction(CallInst, getSubtargetInfo()); 890 } 891 892 // Record our statepoint node in the same section used by STACKMAP 893 // and PATCHPOINT 894 SM.recordStatepoint(MI); 895 } 896 897 void X86AsmPrinter::LowerFAULTING_LOAD_OP(const MachineInstr &MI, 898 X86MCInstLower &MCIL) { 899 // FAULTING_LOAD_OP <def>, <MBB handler>, <load opcode>, <load operands> 900 901 unsigned LoadDefRegister = MI.getOperand(0).getReg(); 902 MCSymbol *HandlerLabel = MI.getOperand(1).getMBB()->getSymbol(); 903 unsigned LoadOpcode = MI.getOperand(2).getImm(); 904 unsigned LoadOperandsBeginIdx = 3; 905 906 FM.recordFaultingOp(FaultMaps::FaultingLoad, HandlerLabel); 907 908 MCInst LoadMI; 909 LoadMI.setOpcode(LoadOpcode); 910 911 if (LoadDefRegister != X86::NoRegister) 912 LoadMI.addOperand(MCOperand::createReg(LoadDefRegister)); 913 914 for (auto I = MI.operands_begin() + LoadOperandsBeginIdx, 915 E = MI.operands_end(); 916 I != E; ++I) 917 if (auto MaybeOperand = MCIL.LowerMachineOperand(&MI, *I)) 918 LoadMI.addOperand(MaybeOperand.getValue()); 919 920 OutStreamer->EmitInstruction(LoadMI, getSubtargetInfo()); 921 } 922 923 void X86AsmPrinter::LowerPATCHABLE_OP(const MachineInstr &MI, 924 X86MCInstLower &MCIL) { 925 // PATCHABLE_OP minsize, opcode, operands 926 927 unsigned MinSize = MI.getOperand(0).getImm(); 928 unsigned Opcode = MI.getOperand(1).getImm(); 929 930 MCInst MCI; 931 MCI.setOpcode(Opcode); 932 for (auto &MO : make_range(MI.operands_begin() + 2, MI.operands_end())) 933 if (auto MaybeOperand = MCIL.LowerMachineOperand(&MI, MO)) 934 MCI.addOperand(MaybeOperand.getValue()); 935 936 SmallString<256> Code; 937 SmallVector<MCFixup, 4> Fixups; 938 raw_svector_ostream VecOS(Code); 939 CodeEmitter->encodeInstruction(MCI, VecOS, Fixups, getSubtargetInfo()); 940 941 if (Code.size() < MinSize) { 942 if (MinSize == 2 && Opcode == X86::PUSH64r) { 943 // This is an optimization that lets us get away without emitting a nop in 944 // many cases. 945 // 946 // NB! In some cases the encoding for PUSH64r (e.g. PUSH64r %R9) takes two 947 // bytes too, so the check on MinSize is important. 948 MCI.setOpcode(X86::PUSH64rmr); 949 } else { 950 unsigned NopSize = EmitNop(*OutStreamer, MinSize, Subtarget->is64Bit(), 951 getSubtargetInfo()); 952 assert(NopSize == MinSize && "Could not implement MinSize!"); 953 (void) NopSize; 954 } 955 } 956 957 OutStreamer->EmitInstruction(MCI, getSubtargetInfo()); 958 } 959 960 // Lower a stackmap of the form: 961 // <id>, <shadowBytes>, ... 962 void X86AsmPrinter::LowerSTACKMAP(const MachineInstr &MI) { 963 SMShadowTracker.emitShadowPadding(*OutStreamer, getSubtargetInfo()); 964 SM.recordStackMap(MI); 965 unsigned NumShadowBytes = MI.getOperand(1).getImm(); 966 SMShadowTracker.reset(NumShadowBytes); 967 } 968 969 // Lower a patchpoint of the form: 970 // [<def>], <id>, <numBytes>, <target>, <numArgs>, <cc>, ... 971 void X86AsmPrinter::LowerPATCHPOINT(const MachineInstr &MI, 972 X86MCInstLower &MCIL) { 973 assert(Subtarget->is64Bit() && "Patchpoint currently only supports X86-64"); 974 975 SMShadowTracker.emitShadowPadding(*OutStreamer, getSubtargetInfo()); 976 977 SM.recordPatchPoint(MI); 978 979 PatchPointOpers opers(&MI); 980 unsigned ScratchIdx = opers.getNextScratchIdx(); 981 unsigned EncodedBytes = 0; 982 const MachineOperand &CalleeMO = opers.getCallTarget(); 983 984 // Check for null target. If target is non-null (i.e. is non-zero or is 985 // symbolic) then emit a call. 986 if (!(CalleeMO.isImm() && !CalleeMO.getImm())) { 987 MCOperand CalleeMCOp; 988 switch (CalleeMO.getType()) { 989 default: 990 /// FIXME: Add a verifier check for bad callee types. 991 llvm_unreachable("Unrecognized callee operand type."); 992 case MachineOperand::MO_Immediate: 993 if (CalleeMO.getImm()) 994 CalleeMCOp = MCOperand::createImm(CalleeMO.getImm()); 995 break; 996 case MachineOperand::MO_ExternalSymbol: 997 case MachineOperand::MO_GlobalAddress: 998 CalleeMCOp = 999 MCIL.LowerSymbolOperand(CalleeMO, 1000 MCIL.GetSymbolFromOperand(CalleeMO)); 1001 break; 1002 } 1003 1004 // Emit MOV to materialize the target address and the CALL to target. 1005 // This is encoded with 12-13 bytes, depending on which register is used. 1006 unsigned ScratchReg = MI.getOperand(ScratchIdx).getReg(); 1007 if (X86II::isX86_64ExtendedReg(ScratchReg)) 1008 EncodedBytes = 13; 1009 else 1010 EncodedBytes = 12; 1011 1012 EmitAndCountInstruction( 1013 MCInstBuilder(X86::MOV64ri).addReg(ScratchReg).addOperand(CalleeMCOp)); 1014 EmitAndCountInstruction(MCInstBuilder(X86::CALL64r).addReg(ScratchReg)); 1015 } 1016 1017 // Emit padding. 1018 unsigned NumBytes = opers.getNumPatchBytes(); 1019 assert(NumBytes >= EncodedBytes && 1020 "Patchpoint can't request size less than the length of a call."); 1021 1022 EmitNops(*OutStreamer, NumBytes - EncodedBytes, Subtarget->is64Bit(), 1023 getSubtargetInfo()); 1024 } 1025 1026 void X86AsmPrinter::recordSled(MCSymbol *Sled, const MachineInstr &MI, 1027 SledKind Kind) { 1028 auto Fn = MI.getParent()->getParent()->getFunction(); 1029 auto Attr = Fn->getFnAttribute("function-instrument"); 1030 bool AlwaysInstrument = 1031 Attr.isStringAttribute() && Attr.getValueAsString() == "xray-always"; 1032 Sleds.emplace_back( 1033 XRayFunctionEntry{Sled, CurrentFnSym, Kind, AlwaysInstrument, Fn}); 1034 } 1035 1036 void X86AsmPrinter::LowerPATCHABLE_FUNCTION_ENTER(const MachineInstr &MI, 1037 X86MCInstLower &MCIL) { 1038 // We want to emit the following pattern: 1039 // 1040 // .p2align 1, ... 1041 // .Lxray_sled_N: 1042 // jmp .tmpN 1043 // # 9 bytes worth of noops 1044 // .tmpN 1045 // 1046 // We need the 9 bytes because at runtime, we'd be patching over the full 11 1047 // bytes with the following pattern: 1048 // 1049 // mov %r10, <function id, 32-bit> // 6 bytes 1050 // call <relative offset, 32-bits> // 5 bytes 1051 // 1052 auto CurSled = OutContext.createTempSymbol("xray_sled_", true); 1053 OutStreamer->EmitCodeAlignment(2); 1054 OutStreamer->EmitLabel(CurSled); 1055 auto Target = OutContext.createTempSymbol(); 1056 1057 // Use a two-byte `jmp`. This version of JMP takes an 8-bit relative offset as 1058 // an operand (computed as an offset from the jmp instruction). 1059 // FIXME: Find another less hacky way do force the relative jump. 1060 OutStreamer->EmitBytes("\xeb\x09"); 1061 EmitNops(*OutStreamer, 9, Subtarget->is64Bit(), getSubtargetInfo()); 1062 OutStreamer->EmitLabel(Target); 1063 recordSled(CurSled, MI, SledKind::FUNCTION_ENTER); 1064 } 1065 1066 void X86AsmPrinter::LowerPATCHABLE_RET(const MachineInstr &MI, 1067 X86MCInstLower &MCIL) { 1068 // Since PATCHABLE_RET takes the opcode of the return statement as an 1069 // argument, we use that to emit the correct form of the RET that we want. 1070 // i.e. when we see this: 1071 // 1072 // PATCHABLE_RET X86::RET ... 1073 // 1074 // We should emit the RET followed by sleds. 1075 // 1076 // .p2align 1, ... 1077 // .Lxray_sled_N: 1078 // ret # or equivalent instruction 1079 // # 10 bytes worth of noops 1080 // 1081 // This just makes sure that the alignment for the next instruction is 2. 1082 auto CurSled = OutContext.createTempSymbol("xray_sled_", true); 1083 OutStreamer->EmitCodeAlignment(2); 1084 OutStreamer->EmitLabel(CurSled); 1085 unsigned OpCode = MI.getOperand(0).getImm(); 1086 MCInst Ret; 1087 Ret.setOpcode(OpCode); 1088 for (auto &MO : make_range(MI.operands_begin() + 1, MI.operands_end())) 1089 if (auto MaybeOperand = MCIL.LowerMachineOperand(&MI, MO)) 1090 Ret.addOperand(MaybeOperand.getValue()); 1091 OutStreamer->EmitInstruction(Ret, getSubtargetInfo()); 1092 EmitNops(*OutStreamer, 10, Subtarget->is64Bit(), getSubtargetInfo()); 1093 recordSled(CurSled, MI, SledKind::FUNCTION_EXIT); 1094 } 1095 1096 void X86AsmPrinter::LowerPATCHABLE_TAIL_CALL(const MachineInstr &MI, X86MCInstLower &MCIL) { 1097 // Like PATCHABLE_RET, we have the actual instruction in the operands to this 1098 // instruction so we lower that particular instruction and its operands. 1099 // Unlike PATCHABLE_RET though, we put the sled before the JMP, much like how 1100 // we do it for PATCHABLE_FUNCTION_ENTER. The sled should be very similar to 1101 // the PATCHABLE_FUNCTION_ENTER case, followed by the lowering of the actual 1102 // tail call much like how we have it in PATCHABLE_RET. 1103 auto CurSled = OutContext.createTempSymbol("xray_sled_", true); 1104 OutStreamer->EmitCodeAlignment(2); 1105 OutStreamer->EmitLabel(CurSled); 1106 auto Target = OutContext.createTempSymbol(); 1107 1108 // Use a two-byte `jmp`. This version of JMP takes an 8-bit relative offset as 1109 // an operand (computed as an offset from the jmp instruction). 1110 // FIXME: Find another less hacky way do force the relative jump. 1111 OutStreamer->EmitBytes("\xeb\x09"); 1112 EmitNops(*OutStreamer, 9, Subtarget->is64Bit(), getSubtargetInfo()); 1113 OutStreamer->EmitLabel(Target); 1114 recordSled(CurSled, MI, SledKind::TAIL_CALL); 1115 1116 unsigned OpCode = MI.getOperand(0).getImm(); 1117 MCInst TC; 1118 TC.setOpcode(OpCode); 1119 1120 // Before emitting the instruction, add a comment to indicate that this is 1121 // indeed a tail call. 1122 OutStreamer->AddComment("TAILCALL"); 1123 for (auto &MO : make_range(MI.operands_begin() + 1, MI.operands_end())) 1124 if (auto MaybeOperand = MCIL.LowerMachineOperand(&MI, MO)) 1125 TC.addOperand(MaybeOperand.getValue()); 1126 OutStreamer->EmitInstruction(TC, getSubtargetInfo()); 1127 } 1128 1129 void X86AsmPrinter::EmitXRayTable() { 1130 if (Sleds.empty()) 1131 return; 1132 if (Subtarget->isTargetELF()) { 1133 auto PrevSection = OutStreamer->getCurrentSectionOnly(); 1134 auto Fn = MF->getFunction(); 1135 MCSection *Section = nullptr; 1136 if (Fn->hasComdat()) { 1137 Section = OutContext.getELFSection("xray_instr_map", ELF::SHT_PROGBITS, 1138 ELF::SHF_ALLOC | ELF::SHF_GROUP, 0, 1139 Fn->getComdat()->getName()); 1140 } else { 1141 Section = OutContext.getELFSection("xray_instr_map", ELF::SHT_PROGBITS, 1142 ELF::SHF_ALLOC); 1143 } 1144 1145 // Before we switch over, we force a reference to a label inside the 1146 // xray_instr_map section. Since EmitXRayTable() is always called just 1147 // before the function's end, we assume that this is happening after the 1148 // last return instruction. 1149 // 1150 // We then align the reference to 16 byte boundaries, which we determined 1151 // experimentally to be beneficial to avoid causing decoder stalls. 1152 MCSymbol *Tmp = OutContext.createTempSymbol("xray_synthetic_", true); 1153 OutStreamer->EmitCodeAlignment(16); 1154 OutStreamer->EmitSymbolValue(Tmp, 8, false); 1155 OutStreamer->SwitchSection(Section); 1156 OutStreamer->EmitLabel(Tmp); 1157 for (const auto &Sled : Sleds) { 1158 OutStreamer->EmitSymbolValue(Sled.Sled, 8); 1159 OutStreamer->EmitSymbolValue(CurrentFnSym, 8); 1160 auto Kind = static_cast<uint8_t>(Sled.Kind); 1161 OutStreamer->EmitBytes( 1162 StringRef(reinterpret_cast<const char *>(&Kind), 1)); 1163 OutStreamer->EmitBytes( 1164 StringRef(reinterpret_cast<const char *>(&Sled.AlwaysInstrument), 1)); 1165 OutStreamer->EmitZeros(14); 1166 } 1167 OutStreamer->SwitchSection(PrevSection); 1168 } 1169 Sleds.clear(); 1170 } 1171 1172 // Returns instruction preceding MBBI in MachineFunction. 1173 // If MBBI is the first instruction of the first basic block, returns null. 1174 static MachineBasicBlock::const_iterator 1175 PrevCrossBBInst(MachineBasicBlock::const_iterator MBBI) { 1176 const MachineBasicBlock *MBB = MBBI->getParent(); 1177 while (MBBI == MBB->begin()) { 1178 if (MBB == &MBB->getParent()->front()) 1179 return MachineBasicBlock::const_iterator(); 1180 MBB = MBB->getPrevNode(); 1181 MBBI = MBB->end(); 1182 } 1183 return --MBBI; 1184 } 1185 1186 static const Constant *getConstantFromPool(const MachineInstr &MI, 1187 const MachineOperand &Op) { 1188 if (!Op.isCPI()) 1189 return nullptr; 1190 1191 ArrayRef<MachineConstantPoolEntry> Constants = 1192 MI.getParent()->getParent()->getConstantPool()->getConstants(); 1193 const MachineConstantPoolEntry &ConstantEntry = 1194 Constants[Op.getIndex()]; 1195 1196 // Bail if this is a machine constant pool entry, we won't be able to dig out 1197 // anything useful. 1198 if (ConstantEntry.isMachineConstantPoolEntry()) 1199 return nullptr; 1200 1201 auto *C = dyn_cast<Constant>(ConstantEntry.Val.ConstVal); 1202 assert((!C || ConstantEntry.getType() == C->getType()) && 1203 "Expected a constant of the same type!"); 1204 return C; 1205 } 1206 1207 static std::string getShuffleComment(const MachineOperand &DstOp, 1208 const MachineOperand &SrcOp1, 1209 const MachineOperand &SrcOp2, 1210 ArrayRef<int> Mask) { 1211 std::string Comment; 1212 1213 // Compute the name for a register. This is really goofy because we have 1214 // multiple instruction printers that could (in theory) use different 1215 // names. Fortunately most people use the ATT style (outside of Windows) 1216 // and they actually agree on register naming here. Ultimately, this is 1217 // a comment, and so its OK if it isn't perfect. 1218 auto GetRegisterName = [](unsigned RegNum) -> StringRef { 1219 return X86ATTInstPrinter::getRegisterName(RegNum); 1220 }; 1221 1222 // TODO: Add support for specifying an AVX512 style mask register in the comment. 1223 StringRef DstName = DstOp.isReg() ? GetRegisterName(DstOp.getReg()) : "mem"; 1224 StringRef Src1Name = 1225 SrcOp1.isReg() ? GetRegisterName(SrcOp1.getReg()) : "mem"; 1226 StringRef Src2Name = 1227 SrcOp2.isReg() ? GetRegisterName(SrcOp2.getReg()) : "mem"; 1228 1229 // One source operand, fix the mask to print all elements in one span. 1230 SmallVector<int, 8> ShuffleMask(Mask.begin(), Mask.end()); 1231 if (Src1Name == Src2Name) 1232 for (int i = 0, e = ShuffleMask.size(); i != e; ++i) 1233 if (ShuffleMask[i] >= e) 1234 ShuffleMask[i] -= e; 1235 1236 raw_string_ostream CS(Comment); 1237 CS << DstName << " = "; 1238 for (int i = 0, e = ShuffleMask.size(); i != e; ++i) { 1239 if (i != 0) 1240 CS << ","; 1241 if (ShuffleMask[i] == SM_SentinelZero) { 1242 CS << "zero"; 1243 continue; 1244 } 1245 1246 // Otherwise, it must come from src1 or src2. Print the span of elements 1247 // that comes from this src. 1248 bool isSrc1 = ShuffleMask[i] < (int)e; 1249 CS << (isSrc1 ? Src1Name : Src2Name) << '['; 1250 1251 bool IsFirst = true; 1252 while (i != e && ShuffleMask[i] != SM_SentinelZero && 1253 (ShuffleMask[i] < (int)e) == isSrc1) { 1254 if (!IsFirst) 1255 CS << ','; 1256 else 1257 IsFirst = false; 1258 if (ShuffleMask[i] == SM_SentinelUndef) 1259 CS << "u"; 1260 else 1261 CS << ShuffleMask[i] % (int)e; 1262 ++i; 1263 } 1264 CS << ']'; 1265 --i; // For loop increments element #. 1266 } 1267 CS.flush(); 1268 1269 return Comment; 1270 } 1271 1272 void X86AsmPrinter::EmitInstruction(const MachineInstr *MI) { 1273 X86MCInstLower MCInstLowering(*MF, *this); 1274 const X86RegisterInfo *RI = MF->getSubtarget<X86Subtarget>().getRegisterInfo(); 1275 1276 switch (MI->getOpcode()) { 1277 case TargetOpcode::DBG_VALUE: 1278 llvm_unreachable("Should be handled target independently"); 1279 1280 // Emit nothing here but a comment if we can. 1281 case X86::Int_MemBarrier: 1282 OutStreamer->emitRawComment("MEMBARRIER"); 1283 return; 1284 1285 1286 case X86::EH_RETURN: 1287 case X86::EH_RETURN64: { 1288 // Lower these as normal, but add some comments. 1289 unsigned Reg = MI->getOperand(0).getReg(); 1290 OutStreamer->AddComment(StringRef("eh_return, addr: %") + 1291 X86ATTInstPrinter::getRegisterName(Reg)); 1292 break; 1293 } 1294 case X86::CLEANUPRET: { 1295 // Lower these as normal, but add some comments. 1296 OutStreamer->AddComment("CLEANUPRET"); 1297 break; 1298 } 1299 1300 case X86::CATCHRET: { 1301 // Lower these as normal, but add some comments. 1302 OutStreamer->AddComment("CATCHRET"); 1303 break; 1304 } 1305 1306 case X86::TAILJMPr: 1307 case X86::TAILJMPm: 1308 case X86::TAILJMPd: 1309 case X86::TAILJMPd_CC: 1310 case X86::TAILJMPr64: 1311 case X86::TAILJMPm64: 1312 case X86::TAILJMPd64: 1313 case X86::TAILJMPd64_CC: 1314 case X86::TAILJMPr64_REX: 1315 case X86::TAILJMPm64_REX: 1316 // Lower these as normal, but add some comments. 1317 OutStreamer->AddComment("TAILCALL"); 1318 break; 1319 1320 case X86::TLS_addr32: 1321 case X86::TLS_addr64: 1322 case X86::TLS_base_addr32: 1323 case X86::TLS_base_addr64: 1324 return LowerTlsAddr(MCInstLowering, *MI); 1325 1326 case X86::MOVPC32r: { 1327 // This is a pseudo op for a two instruction sequence with a label, which 1328 // looks like: 1329 // call "L1$pb" 1330 // "L1$pb": 1331 // popl %esi 1332 1333 // Emit the call. 1334 MCSymbol *PICBase = MF->getPICBaseSymbol(); 1335 // FIXME: We would like an efficient form for this, so we don't have to do a 1336 // lot of extra uniquing. 1337 EmitAndCountInstruction(MCInstBuilder(X86::CALLpcrel32) 1338 .addExpr(MCSymbolRefExpr::create(PICBase, OutContext))); 1339 1340 const X86FrameLowering* FrameLowering = 1341 MF->getSubtarget<X86Subtarget>().getFrameLowering(); 1342 bool hasFP = FrameLowering->hasFP(*MF); 1343 1344 // TODO: This is needed only if we require precise CFA. 1345 bool HasActiveDwarfFrame = OutStreamer->getNumFrameInfos() && 1346 !OutStreamer->getDwarfFrameInfos().back().End; 1347 1348 int stackGrowth = -RI->getSlotSize(); 1349 1350 if (HasActiveDwarfFrame && !hasFP) { 1351 OutStreamer->EmitCFIAdjustCfaOffset(-stackGrowth); 1352 } 1353 1354 // Emit the label. 1355 OutStreamer->EmitLabel(PICBase); 1356 1357 // popl $reg 1358 EmitAndCountInstruction(MCInstBuilder(X86::POP32r) 1359 .addReg(MI->getOperand(0).getReg())); 1360 1361 if (HasActiveDwarfFrame && !hasFP) { 1362 OutStreamer->EmitCFIAdjustCfaOffset(stackGrowth); 1363 } 1364 return; 1365 } 1366 1367 case X86::ADD32ri: { 1368 // Lower the MO_GOT_ABSOLUTE_ADDRESS form of ADD32ri. 1369 if (MI->getOperand(2).getTargetFlags() != X86II::MO_GOT_ABSOLUTE_ADDRESS) 1370 break; 1371 1372 // Okay, we have something like: 1373 // EAX = ADD32ri EAX, MO_GOT_ABSOLUTE_ADDRESS(@MYGLOBAL) 1374 1375 // For this, we want to print something like: 1376 // MYGLOBAL + (. - PICBASE) 1377 // However, we can't generate a ".", so just emit a new label here and refer 1378 // to it. 1379 MCSymbol *DotSym = OutContext.createTempSymbol(); 1380 OutStreamer->EmitLabel(DotSym); 1381 1382 // Now that we have emitted the label, lower the complex operand expression. 1383 MCSymbol *OpSym = MCInstLowering.GetSymbolFromOperand(MI->getOperand(2)); 1384 1385 const MCExpr *DotExpr = MCSymbolRefExpr::create(DotSym, OutContext); 1386 const MCExpr *PICBase = 1387 MCSymbolRefExpr::create(MF->getPICBaseSymbol(), OutContext); 1388 DotExpr = MCBinaryExpr::createSub(DotExpr, PICBase, OutContext); 1389 1390 DotExpr = MCBinaryExpr::createAdd(MCSymbolRefExpr::create(OpSym,OutContext), 1391 DotExpr, OutContext); 1392 1393 EmitAndCountInstruction(MCInstBuilder(X86::ADD32ri) 1394 .addReg(MI->getOperand(0).getReg()) 1395 .addReg(MI->getOperand(1).getReg()) 1396 .addExpr(DotExpr)); 1397 return; 1398 } 1399 case TargetOpcode::STATEPOINT: 1400 return LowerSTATEPOINT(*MI, MCInstLowering); 1401 1402 case TargetOpcode::FAULTING_LOAD_OP: 1403 return LowerFAULTING_LOAD_OP(*MI, MCInstLowering); 1404 1405 case TargetOpcode::PATCHABLE_OP: 1406 return LowerPATCHABLE_OP(*MI, MCInstLowering); 1407 1408 case TargetOpcode::STACKMAP: 1409 return LowerSTACKMAP(*MI); 1410 1411 case TargetOpcode::PATCHPOINT: 1412 return LowerPATCHPOINT(*MI, MCInstLowering); 1413 1414 case TargetOpcode::PATCHABLE_FUNCTION_ENTER: 1415 return LowerPATCHABLE_FUNCTION_ENTER(*MI, MCInstLowering); 1416 1417 case TargetOpcode::PATCHABLE_RET: 1418 return LowerPATCHABLE_RET(*MI, MCInstLowering); 1419 1420 case TargetOpcode::PATCHABLE_TAIL_CALL: 1421 return LowerPATCHABLE_TAIL_CALL(*MI, MCInstLowering); 1422 1423 case X86::MORESTACK_RET: 1424 EmitAndCountInstruction(MCInstBuilder(getRetOpcode(*Subtarget))); 1425 return; 1426 1427 case X86::MORESTACK_RET_RESTORE_R10: 1428 // Return, then restore R10. 1429 EmitAndCountInstruction(MCInstBuilder(getRetOpcode(*Subtarget))); 1430 EmitAndCountInstruction(MCInstBuilder(X86::MOV64rr) 1431 .addReg(X86::R10) 1432 .addReg(X86::RAX)); 1433 return; 1434 1435 case X86::SEH_PushReg: 1436 OutStreamer->EmitWinCFIPushReg(RI->getSEHRegNum(MI->getOperand(0).getImm())); 1437 return; 1438 1439 case X86::SEH_SaveReg: 1440 OutStreamer->EmitWinCFISaveReg(RI->getSEHRegNum(MI->getOperand(0).getImm()), 1441 MI->getOperand(1).getImm()); 1442 return; 1443 1444 case X86::SEH_SaveXMM: 1445 OutStreamer->EmitWinCFISaveXMM(RI->getSEHRegNum(MI->getOperand(0).getImm()), 1446 MI->getOperand(1).getImm()); 1447 return; 1448 1449 case X86::SEH_StackAlloc: 1450 OutStreamer->EmitWinCFIAllocStack(MI->getOperand(0).getImm()); 1451 return; 1452 1453 case X86::SEH_SetFrame: 1454 OutStreamer->EmitWinCFISetFrame(RI->getSEHRegNum(MI->getOperand(0).getImm()), 1455 MI->getOperand(1).getImm()); 1456 return; 1457 1458 case X86::SEH_PushFrame: 1459 OutStreamer->EmitWinCFIPushFrame(MI->getOperand(0).getImm()); 1460 return; 1461 1462 case X86::SEH_EndPrologue: 1463 OutStreamer->EmitWinCFIEndProlog(); 1464 return; 1465 1466 case X86::SEH_Epilogue: { 1467 MachineBasicBlock::const_iterator MBBI(MI); 1468 // Check if preceded by a call and emit nop if so. 1469 for (MBBI = PrevCrossBBInst(MBBI); 1470 MBBI != MachineBasicBlock::const_iterator(); 1471 MBBI = PrevCrossBBInst(MBBI)) { 1472 // Conservatively assume that pseudo instructions don't emit code and keep 1473 // looking for a call. We may emit an unnecessary nop in some cases. 1474 if (!MBBI->isPseudo()) { 1475 if (MBBI->isCall()) 1476 EmitAndCountInstruction(MCInstBuilder(X86::NOOP)); 1477 break; 1478 } 1479 } 1480 return; 1481 } 1482 1483 // Lower PSHUFB and VPERMILP normally but add a comment if we can find 1484 // a constant shuffle mask. We won't be able to do this at the MC layer 1485 // because the mask isn't an immediate. 1486 case X86::PSHUFBrm: 1487 case X86::VPSHUFBrm: 1488 case X86::VPSHUFBYrm: 1489 case X86::VPSHUFBZ128rm: 1490 case X86::VPSHUFBZ128rmk: 1491 case X86::VPSHUFBZ128rmkz: 1492 case X86::VPSHUFBZ256rm: 1493 case X86::VPSHUFBZ256rmk: 1494 case X86::VPSHUFBZ256rmkz: 1495 case X86::VPSHUFBZrm: 1496 case X86::VPSHUFBZrmk: 1497 case X86::VPSHUFBZrmkz: { 1498 if (!OutStreamer->isVerboseAsm()) 1499 break; 1500 unsigned SrcIdx, MaskIdx; 1501 switch (MI->getOpcode()) { 1502 default: llvm_unreachable("Invalid opcode"); 1503 case X86::PSHUFBrm: 1504 case X86::VPSHUFBrm: 1505 case X86::VPSHUFBYrm: 1506 case X86::VPSHUFBZ128rm: 1507 case X86::VPSHUFBZ256rm: 1508 case X86::VPSHUFBZrm: 1509 SrcIdx = 1; MaskIdx = 5; break; 1510 case X86::VPSHUFBZ128rmkz: 1511 case X86::VPSHUFBZ256rmkz: 1512 case X86::VPSHUFBZrmkz: 1513 SrcIdx = 2; MaskIdx = 6; break; 1514 case X86::VPSHUFBZ128rmk: 1515 case X86::VPSHUFBZ256rmk: 1516 case X86::VPSHUFBZrmk: 1517 SrcIdx = 3; MaskIdx = 7; break; 1518 } 1519 1520 assert(MI->getNumOperands() >= 6 && 1521 "We should always have at least 6 operands!"); 1522 const MachineOperand &DstOp = MI->getOperand(0); 1523 const MachineOperand &SrcOp = MI->getOperand(SrcIdx); 1524 const MachineOperand &MaskOp = MI->getOperand(MaskIdx); 1525 1526 if (auto *C = getConstantFromPool(*MI, MaskOp)) { 1527 SmallVector<int, 16> Mask; 1528 DecodePSHUFBMask(C, Mask); 1529 if (!Mask.empty()) 1530 OutStreamer->AddComment(getShuffleComment(DstOp, SrcOp, SrcOp, Mask)); 1531 } 1532 break; 1533 } 1534 1535 case X86::VPERMILPDrm: 1536 case X86::VPERMILPDYrm: 1537 case X86::VPERMILPDZ128rm: 1538 case X86::VPERMILPDZ256rm: 1539 case X86::VPERMILPDZrm: { 1540 if (!OutStreamer->isVerboseAsm()) 1541 break; 1542 assert(MI->getNumOperands() > 5 && 1543 "We should always have at least 5 operands!"); 1544 const MachineOperand &DstOp = MI->getOperand(0); 1545 const MachineOperand &SrcOp = MI->getOperand(1); 1546 const MachineOperand &MaskOp = MI->getOperand(5); 1547 1548 if (auto *C = getConstantFromPool(*MI, MaskOp)) { 1549 SmallVector<int, 8> Mask; 1550 DecodeVPERMILPMask(C, 64, Mask); 1551 if (!Mask.empty()) 1552 OutStreamer->AddComment(getShuffleComment(DstOp, SrcOp, SrcOp, Mask)); 1553 } 1554 break; 1555 } 1556 1557 case X86::VPERMILPSrm: 1558 case X86::VPERMILPSYrm: 1559 case X86::VPERMILPSZ128rm: 1560 case X86::VPERMILPSZ256rm: 1561 case X86::VPERMILPSZrm: { 1562 if (!OutStreamer->isVerboseAsm()) 1563 break; 1564 assert(MI->getNumOperands() > 5 && 1565 "We should always have at least 5 operands!"); 1566 const MachineOperand &DstOp = MI->getOperand(0); 1567 const MachineOperand &SrcOp = MI->getOperand(1); 1568 const MachineOperand &MaskOp = MI->getOperand(5); 1569 1570 if (auto *C = getConstantFromPool(*MI, MaskOp)) { 1571 SmallVector<int, 16> Mask; 1572 DecodeVPERMILPMask(C, 32, Mask); 1573 if (!Mask.empty()) 1574 OutStreamer->AddComment(getShuffleComment(DstOp, SrcOp, SrcOp, Mask)); 1575 } 1576 break; 1577 } 1578 1579 case X86::VPERMIL2PDrm: 1580 case X86::VPERMIL2PSrm: 1581 case X86::VPERMIL2PDrmY: 1582 case X86::VPERMIL2PSrmY: { 1583 if (!OutStreamer->isVerboseAsm()) 1584 break; 1585 assert(MI->getNumOperands() > 7 && 1586 "We should always have at least 7 operands!"); 1587 const MachineOperand &DstOp = MI->getOperand(0); 1588 const MachineOperand &SrcOp1 = MI->getOperand(1); 1589 const MachineOperand &SrcOp2 = MI->getOperand(2); 1590 const MachineOperand &MaskOp = MI->getOperand(6); 1591 const MachineOperand &CtrlOp = MI->getOperand(MI->getNumOperands() - 1); 1592 1593 if (!CtrlOp.isImm()) 1594 break; 1595 1596 unsigned ElSize; 1597 switch (MI->getOpcode()) { 1598 default: llvm_unreachable("Invalid opcode"); 1599 case X86::VPERMIL2PSrm: case X86::VPERMIL2PSrmY: ElSize = 32; break; 1600 case X86::VPERMIL2PDrm: case X86::VPERMIL2PDrmY: ElSize = 64; break; 1601 } 1602 1603 if (auto *C = getConstantFromPool(*MI, MaskOp)) { 1604 SmallVector<int, 16> Mask; 1605 DecodeVPERMIL2PMask(C, (unsigned)CtrlOp.getImm(), ElSize, Mask); 1606 if (!Mask.empty()) 1607 OutStreamer->AddComment(getShuffleComment(DstOp, SrcOp1, SrcOp2, Mask)); 1608 } 1609 break; 1610 } 1611 1612 case X86::VPPERMrrm: { 1613 if (!OutStreamer->isVerboseAsm()) 1614 break; 1615 assert(MI->getNumOperands() > 6 && 1616 "We should always have at least 6 operands!"); 1617 const MachineOperand &DstOp = MI->getOperand(0); 1618 const MachineOperand &SrcOp1 = MI->getOperand(1); 1619 const MachineOperand &SrcOp2 = MI->getOperand(2); 1620 const MachineOperand &MaskOp = MI->getOperand(6); 1621 1622 if (auto *C = getConstantFromPool(*MI, MaskOp)) { 1623 SmallVector<int, 16> Mask; 1624 DecodeVPPERMMask(C, Mask); 1625 if (!Mask.empty()) 1626 OutStreamer->AddComment(getShuffleComment(DstOp, SrcOp1, SrcOp2, Mask)); 1627 } 1628 break; 1629 } 1630 1631 #define MOV_CASE(Prefix, Suffix) \ 1632 case X86::Prefix##MOVAPD##Suffix##rm: \ 1633 case X86::Prefix##MOVAPS##Suffix##rm: \ 1634 case X86::Prefix##MOVUPD##Suffix##rm: \ 1635 case X86::Prefix##MOVUPS##Suffix##rm: \ 1636 case X86::Prefix##MOVDQA##Suffix##rm: \ 1637 case X86::Prefix##MOVDQU##Suffix##rm: 1638 1639 #define MOV_AVX512_CASE(Suffix) \ 1640 case X86::VMOVDQA64##Suffix##rm: \ 1641 case X86::VMOVDQA32##Suffix##rm: \ 1642 case X86::VMOVDQU64##Suffix##rm: \ 1643 case X86::VMOVDQU32##Suffix##rm: \ 1644 case X86::VMOVDQU16##Suffix##rm: \ 1645 case X86::VMOVDQU8##Suffix##rm: \ 1646 case X86::VMOVAPS##Suffix##rm: \ 1647 case X86::VMOVAPD##Suffix##rm: \ 1648 case X86::VMOVUPS##Suffix##rm: \ 1649 case X86::VMOVUPD##Suffix##rm: 1650 1651 #define CASE_ALL_MOV_RM() \ 1652 MOV_CASE(, ) /* SSE */ \ 1653 MOV_CASE(V, ) /* AVX-128 */ \ 1654 MOV_CASE(V, Y) /* AVX-256 */ \ 1655 MOV_AVX512_CASE(Z) \ 1656 MOV_AVX512_CASE(Z256) \ 1657 MOV_AVX512_CASE(Z128) 1658 1659 // For loads from a constant pool to a vector register, print the constant 1660 // loaded. 1661 CASE_ALL_MOV_RM() 1662 if (!OutStreamer->isVerboseAsm()) 1663 break; 1664 if (MI->getNumOperands() > 4) 1665 if (auto *C = getConstantFromPool(*MI, MI->getOperand(4))) { 1666 std::string Comment; 1667 raw_string_ostream CS(Comment); 1668 const MachineOperand &DstOp = MI->getOperand(0); 1669 CS << X86ATTInstPrinter::getRegisterName(DstOp.getReg()) << " = "; 1670 if (auto *CDS = dyn_cast<ConstantDataSequential>(C)) { 1671 CS << "["; 1672 for (int i = 0, NumElements = CDS->getNumElements(); i < NumElements; ++i) { 1673 if (i != 0) 1674 CS << ","; 1675 if (CDS->getElementType()->isIntegerTy()) 1676 CS << CDS->getElementAsInteger(i); 1677 else if (CDS->getElementType()->isFloatTy()) 1678 CS << CDS->getElementAsFloat(i); 1679 else if (CDS->getElementType()->isDoubleTy()) 1680 CS << CDS->getElementAsDouble(i); 1681 else 1682 CS << "?"; 1683 } 1684 CS << "]"; 1685 OutStreamer->AddComment(CS.str()); 1686 } else if (auto *CV = dyn_cast<ConstantVector>(C)) { 1687 CS << "<"; 1688 for (int i = 0, NumOperands = CV->getNumOperands(); i < NumOperands; ++i) { 1689 if (i != 0) 1690 CS << ","; 1691 Constant *COp = CV->getOperand(i); 1692 if (isa<UndefValue>(COp)) { 1693 CS << "u"; 1694 } else if (auto *CI = dyn_cast<ConstantInt>(COp)) { 1695 if (CI->getBitWidth() <= 64) { 1696 CS << CI->getZExtValue(); 1697 } else { 1698 // print multi-word constant as (w0,w1) 1699 const auto &Val = CI->getValue(); 1700 CS << "("; 1701 for (int i = 0, N = Val.getNumWords(); i < N; ++i) { 1702 if (i > 0) 1703 CS << ","; 1704 CS << Val.getRawData()[i]; 1705 } 1706 CS << ")"; 1707 } 1708 } else if (auto *CF = dyn_cast<ConstantFP>(COp)) { 1709 SmallString<32> Str; 1710 CF->getValueAPF().toString(Str); 1711 CS << Str; 1712 } else { 1713 CS << "?"; 1714 } 1715 } 1716 CS << ">"; 1717 OutStreamer->AddComment(CS.str()); 1718 } 1719 } 1720 break; 1721 } 1722 1723 MCInst TmpInst; 1724 MCInstLowering.Lower(MI, TmpInst); 1725 1726 // Stackmap shadows cannot include branch targets, so we can count the bytes 1727 // in a call towards the shadow, but must ensure that the no thread returns 1728 // in to the stackmap shadow. The only way to achieve this is if the call 1729 // is at the end of the shadow. 1730 if (MI->isCall()) { 1731 // Count then size of the call towards the shadow 1732 SMShadowTracker.count(TmpInst, getSubtargetInfo(), CodeEmitter.get()); 1733 // Then flush the shadow so that we fill with nops before the call, not 1734 // after it. 1735 SMShadowTracker.emitShadowPadding(*OutStreamer, getSubtargetInfo()); 1736 // Then emit the call 1737 OutStreamer->EmitInstruction(TmpInst, getSubtargetInfo()); 1738 return; 1739 } 1740 1741 EmitAndCountInstruction(TmpInst); 1742 } 1743